[Retros] 6-pawn related problem

[Nicolas DUPONT]

>Am I correct in thinking that none of the submitted 6-pawn problems is

>dual-free?


What is (are) the dual in my own attempt ?

And what about the following related problem ? Construct a SPG (without any
dual) showing some column (say z) where z2 z3 z4 are black pawns and z5 z6
z7 are white pawns.


Nicolas DuponT...

PS :  I also prefer that the command "reply" send our messages to the whole
retro-corner family.